Fuse plug



- T. slAMPos *June 2o, 1933.

FUSE PLUG Filed Ju1y'20, 1951 A T'ORNEY Patented June 20, 1933 UNITEDSTATES TREEFON SIAMPOS, OF EDWARDSVILLE, ILLINOIS FUSE PLUG Applicationfiled J'uly 20,

This invention relates to fuse lugs and has for its object theproduction of a simple and efficient fuse plug, wherein, the fusesmounted therein may be renewed merely by 5 turning a plug to bring a newfuse into position.

Another object of this invention is the production of a simple andefficient means for facilitating the renewal of the fuse withlo out thenecessity of removing the plug from the socket.

A still further object of this invention is the production of a simpleand eficient fuse plug which is so constructed as to mount a pluralityof fuse strips within the plug so as to be engaged by means of asuitable contact through the medium of a rotating central core, wherebythe fuses may be renewed merely by rotating the central core.

A still further object of this invention is the production of a fuseplug which is simple in construction and efficient in use.

Vith these and other objects in view, the invention consists in certainnovel constructions, combination and arrangements of ill-,0 plug.

Figure 2 is a section taken on line 2-2 of Figure 1.

Figure 3 is an end elevation of the body of the fuse plug, the centralrotating core 'i being removed therefrom.

Figure 4 is a section taken on line 4-4 of Figure 3.

Figure 5 is a transverse Sectional View through the rotating core.

f- 40 Figure 6 is a fragmentary sectional view taken on line 6 6 ofFigure 5.

' Figure 7 is a detail perspective view of the rotating core or plug.

Figure 8 is a fragmentary perspective view 55 offa portion of the sidewall of the plug,

showing the fuse strips mounted thereon. Figure 9 is a view of a seriesof the fuse strips.

Figure 10 is a perspective view of one of 59 the fuse strips.

1931. Serial No. 552,022.

Figure 1l is a front elevation of one end of one of the fuse strips.

Figure 12 is an edge elevation ofthe upper edge of one of the fusestrips.

By referring to the drawing it will be noted that 1 designates the bodyof the fuse plug which is provided with the usual threaded contacting ormetallic thimble 2 at its inner end. This thimble extends over the loweredge of the body l as is clearly shown in Figure 1, for the purpose offorming contacting engagement with the inner end of a bank of fusestripshereinafter more fully described.

This body l is provided with an enlarged outer end 3, which enlargedouter end 3 is provided with a socket 4 for the purpose of receiving theenlarged head 5 of the rotating plug 6. The enlarged outer end 3 of thebody 1 of the plug is provided with a shoulder portion 7, and an insetledge portion 8.

A bank of fuse strips preferably formed from a, single sheet of material9 is employed, and the fuse strips extend from the lower end of the'strip 9 in the nature of a plurality of parallel fingers 10. Thesefingers 10 are provided with cut out portions 11, as is usual with fusestrips of this character. These strips may be either .formed singularlyor may be formed in one bank of strips such as shown in Figure 9 for thepurpose 0f convenient assembling and forthe purpose of properly spacingthe strips 10 apart. The lower edge 12 of the bank of fuse strips 9 isadapted to normally Contact with the lower end or inner end of thethreaded contact thimble 2 previously described.y

The outer end of each fuse strip finger' 10 is bent at an angle,preferably an angle of forty-five degrees as indicated at 13, for thepurpose of producing a ratchet tooth 14, which is then bentsubstantially at right angles to the longitudinal aXis of the finger 10,and is adapted to rest upon the ledge portion 8 of the body l of theplug, as shown clearly in Figure 8 of the drawing. The outer end of thefinger l0 is then'bent upwardly to extend snugly against the wall 15'ofthe body 1, and then overhangs the shoulder 7, the terminal clip 16 ofthe fuseioo finger strips 10 being forced down into the channel 17formed in the shoulder 7. A retaining washer 18 is then placed thereoverfor the purpose of holding the end of the fuse iinger strips in positionas clearly shown in the drawing.

As clearly shown in Figures 4 and 8 ot' the drawing, it will be seenthat the finger Jfuse strips 10 will extend longitudinally of the body 1of the fuse plug and the ratchet teeth 14 formed near the upper end ofthe fuse finger strips 10 will constitute a ratchet surface along theledge 8, which ratchet surface is adapted to be engaged by the springdog or pawl 19 carried by the rotatable plug 6. This rotatable plug orcore 6 is provided with an elongated shank 19, which has secured theretoa contacting strip 20, )referably placed within a longitudinallyextending channel 21 formed in the shank. This contacting strip 20,however, may be connected in any suitable or desired manner to the )lug6 without departing from the spirit of t e invention and has its innerend provided with a contacting plate 22 which projects beyond theextremity of the plug or core 6 and tits snugly against the disk ofinsulation 22 which projects radially from the inner end of the plugy orcore 6 as shown clearly in Figure 2 and prevents the plug from slippinglongitudinally out of its proper position. A suitable filler 2 3 may beemployed for the purpose of closing the longitudinal channel 21 of theshank 19 and this core or iller 23 may be secured to the shank by meansof suitable screws shown in dotted lines or held in engagement therewithin any suitable or desired manner.

The outer end of the contacting strip 20 is bent at right angles andfits in a socket 24 formed in the head 5 ot' the core or plug 6, thespring dog or pawl 19 projecting beyond the socket and being adapted toengage the ratchet portion 14 of the fuse finger strips 10 as is clearlyshown in Figure 2 of the drawing.

From the foregoing description, it will be seen that a very simple andeiiicient means has been produced for mounting a plurality of fusestrips within the body of the fuse plug so as to be brought intoprogressive engagement with the contacting pawl 19. Then one fuse ingerstrip 10 burns out, the operator may merely grasp the grip portion 25 ofthe rotating core or plug 6 and turn the same until the pawl 19 engagesone of the ratchets 14 of the remaining fuse strips or fingers 10. Thenas each fuse is burned, the plug may be rotated so as to cause a propercontact between the pawl 19 and one of the fuse strip fingers 10. Theouter face of the enlarged portion 3 of the body lis provided withsuitable numerals as shown in Figure 1 to correspond with the fusefinger strips 10 secured and mounted within the body 1 and a suitablearrow 26 is formed upon the grip portion 25 so as to permit an operatorto readily determine whether or not the plug or core 6 is in properposition for causing the pawl 19 to contact with one of the ratchetportions 14 of the fuse strip ingers 10.

It should be understood that certain detail changes in mechanicalconstruction may be employed without departing from thespirit of theinvention, so long as these changes fall within the scope of theappended claims.

Having described the invention, what I claim as new is:

1. A multiple fuse plug of the class de scribed comprising a body, alurality of fuse strips mounted within said) body, said fuse stripsprovided with ratchet means formed thereon, and a rotating core mountedwithin said body provided with means for contacting with said ratchetmeans for forming a contact with said removable fuse strips.

2. A multiple fuse plug of the class described comprising a body, aplurality of fuse strips mounted within said body and provided withangularly bent ratchet portions terminating in offset outer ends, saidends terminating in inwardly bent lips, said body provided with achannel `for receiving said lips, a washer for clamping the extremitiesof said fuse strips in position, a rotating core mounted within saidbody and provided with a contacting strip, said contacting stripprovided with a pawl for engaging said ratchet portion of said fusestris whereby said fuse strips may be broug t into progressivecontacting engagement with said )awl to permit of the progressiverenewal oi the fuses within the body.

3. A multiple fuse plug of the class described comprising a body havingan enlarged outer end, said enlarged outer end provided with an insetshoulder portion and a further inset ledge portion, a plurality offusible strips mounted within said body and having the ends thereofoverhanging said ledge portion, said ends being twisted to produceratchet teeth, the terminals of said ends being constructed insubstantially U-shaped formation, said body provided with a channel forreceiving the extremities of said fuse strips, a washer for engaging theouter portions of said fuse strips an holding the same in position uponsaid body, a rotating core, a contacting member having a laterallyextending end terminating in a spring pawl adapted to ride over thefaces of said ratchet portions ot said fuse strips for formingcontacting relation therewith as said core is rotated, and means forfacilitating the rotation of said core.

4;. A multiple .fuse plug of the class described comprising a body, saidbody provided with a central bore, a bank of fuse fingers extendinglongitudinally of said bore and being integrally connected at theirlower ends, the outer end of each fuse finger being bent laterally andpitched upwardly with respect to its tranverse axis to produce a ratchettooth, the extremity of each Ifuse finger being bent to form a hookedouter end, means for clamping said hooked outer end into engagement withsaid body, a rotating core mounted within said body and contacting meanscarried by said core for engagement with said fuse strips.

5. A multiple fuse plug comprising a body, a core rotatably mountedwithin said body, a plurality of fuse strips mounted within said bodyabout the core and having portions adjacent their outer ends bent toform ratchet elements, a contact strip extending longitudinally in saidcore and having one end exposed at the inner end of the core and itsouter end portion bent to form a dog adapted to engage said ratchetelements for progressive contact with said fuse strips as the core isrotated within the body and prevent rotation of the core in onedirection.

6. A multiple ,fuse plug comprising a body, a plurality of fuse stripsmounted within said body, said fuse strips having their inner endsconnected with each other and each being bent adjacent its outer end toform a laterally bent and angularly twisted ratchet element, a rotatablecore mounted within said body, and a center contact eX- tendinglongitudinally in said core and having an arm extending radially of thecore .for forming electrical contact with the ratchet elements of thefuse strips whereby said fuse strips may be successively brought intocontacting relation with said arm by rotating the core in the body.

In testimony whereof I aix my signature.

TREEFON SIAMPOS.

